He is here in US, his mom somewhere in Maharastra with old age, and hence hard time to read, and understand some complicated form in Marathi,.. n’ she needs to fill it out and send back in Marathi for her pensions,..

And he being raised in US, knows not Marathi much,… and he have to send it filled it back in Marathi, with proper answers,…

All I would say,. That dictionary will not work,…

Scan it, post it on imageshack/imgur/photobucket,..

Make one standard post, asking for assistance and those photo-links,.. and post on 5-7 desi forums,
and whoever responds,.. ask him to how to and what to write in Martahi, what you want to,…. Also work out how Google translate will help to convert English to Marathi..

Or,.. Best bet would be,..go to your local Marathi community in US / Marathi friends / relatives and get help from them for understanding and filling it out in person.